CN103887595A - Antenna system - Google Patents

Antenna system Download PDF

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Publication number
CN103887595A
CN103887595A CN201310729083.3A CN201310729083A CN103887595A CN 103887595 A CN103887595 A CN 103887595A CN 201310729083 A CN201310729083 A CN 201310729083A CN 103887595 A CN103887595 A CN 103887595A
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Prior art keywords
antenna
line coupler
microstrip line
antenna system
main antenna
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CN201310729083.3A
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CN103887595B (en
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卢信嘉
饶佩宗
萧翔宇
童维信
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HTC Corp
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High Tech Computer Corp
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Abstract

An antenna system includes a ground plane, a microstrip-line coupler, a metal cover, and a main antenna. The microstrip-line coupler has a first input port, a second input port, a first output port, and a second output port. The metal cover is disposed above the microstrip-line coupler and coupled to the ground plane. The main antenna is coupled to the first output port and the second output port of the microstrip-line coupler. The metal cover is configured to reduce the interference from the microstrip-line coupler and to enhance the gain of the main antenna.

Description

Antenna system
Technical field
The present invention relates to a kind of antenna system, particularly relate to the antenna system applicable to device for mobile communication.
Background technology
In communication system, if transmission antenna and reception antenna have different polarised directions, may cause quite negative impact to efficiency of transmission.For instance, if transmission antenna is horizontal polarization (Horizontally Polarized), reception antenna also must be designed to horizontal polarization to obtain maximum transmitted efficiency.Otherwise the reception antenna that belongs to perpendicular polarization (Vertically Polarized) may cannot receive the signal of any horizontal polarization at all.Again for example, be right circular polarization (Right Hand Circularly Polarized, RHCP) if transmit antenna, reception antenna also must be designed to right circular polarization to obtain maximum transmitted efficiency.Otherwise the reception antenna that belongs to left circular polarization (Left Hand Circularly Polarized, LHCP) may cannot receive the signal of any right circular polarization at all.
When communication system be applicable to video streaming (Video Streaming), game, or data shift time, owing to there is no enough transmitting bandwidths, the data that transmit must be compressed conventionally.For example, but the data after compression but have some shortcomings: distortion (Distortion), quality reduce, propagation delay, and packet loss etc.For example, for the unpressed image data of transmission under low frequency (5GHz), for example: via wireless family digital interface (Wireless Home Digital Interface, WHDI), conventionally need at least four antennas to transmit the image of 1080P.This kind of Antenna Design often cannot be applied mechanically to general mobile phone because size is too large.Therefore, how designing a kind of small size antenna with adjustable polarised direction, is a major challenge of Antenna Design person now.
Summary of the invention
In an example embodiment, the invention provides a kind of antenna system, comprising: a ground plane; One microstrip line coupler, has a first input end mouth, one second input port, one first output port, and one second output port; One crown cap, is arranged at the top of this microstrip line coupler, and is coupled to this ground plane; And a main antenna, be coupled to this first output port and this second output port of this microstrip line coupler.
Accompanying drawing explanation
Figure 1A shows according to the vertical view of the antenna system described in one embodiment of the invention;
Figure 1B shows according to the end view of the antenna system described in one embodiment of the invention;
Fig. 2 A shows according to the microstrip line coupler described in one embodiment of the invention and the vertical view of crown cap;
Fig. 2 B shows according to the microstrip line coupler described in one embodiment of the invention and the stereogram of crown cap;
Fig. 3 A is the current distributing figure showing when being placed on main antenna and being excited according to the metal described in one embodiment of the invention;
Fig. 3 B is the current distributing figure showing when being placed on main antenna and being excited according to the metal described in another embodiment of the present invention.
Symbol description
100～antenna system;
110～ground plane;
120～microstrip line coupler;
121～first input end mouth;
122～the second input ports;
123～the first output ports;
124～the second output ports;
130～crown cap;
131～short cut holing of main and auxilliary shafts part;
140～main antenna;
150～Parasitica;
GC1～coupling gap;
X, y, z～axes of coordinates.
Embodiment
For object of the present invention, feature and advantage can be become apparent, cited below particularly go out specific embodiments of the invention, and coordinate appended accompanying drawing, be described in detail below.
Figure 1A shows according to the vertical view of the antenna system 100 described in one embodiment of the invention.Figure 1B shows according to the end view of the antenna system 100 described in one embodiment of the invention.Antenna system 100 for example, applicable to a device for mobile communication: a Smartphone (Smart Phone), a panel computer (Tablet Computer), and a notebook computer (Notebook Computer).In preferred embodiment, antenna system 100 at least comprises: a ground plane 110, a microstrip line coupler (Microstrip Line Coupler) 120, a crown cap 130, and a main antenna 140.Ground plane 110 can be arranged at (not shown) on a medium substrate, for example: a FR4 (Flame Retardant4) substrate, or low temperature co-fired multi-layer ceramics (Low Temperature Co-fired Ceramic, a LTCC) substrate.In certain embodiments, this device for mobile communication with antenna system 100 also can comprise other elements, for example: a processor, a touch-control module, a display module, a battery, a radio frequency (Radio Frequency, RF) module, and a shell (not shown).
Fig. 2 A shows according to the vertical view of the microstrip line coupler 120 described in one embodiment of the invention and crown cap 130.Fig. 2 B shows according to the stereogram of the microstrip line coupler 120 described in one embodiment of the invention and crown cap 130.Please also refer to Figure 1A, 1B, 2A, 2B.Microstrip line coupler 120 has a first input end mouth 121, one second input port 122, one first output port 123, and one second output port 124.The first input end mouth 121 of microstrip line coupler 120 and the second input port 122 are to be coupled to a signal source (not shown), for example: this radio-frequency module of this device for mobile communication.The first output port 123 of microstrip line coupler 120 and the second output port 124 are to be coupled to main antenna 140, and for exciting main antenna 140.In certain embodiments, microstrip line coupler 120 is one 90 degree branch line couplers (90 ゜ Branch Line Coupler).In more detail, this 90 degree branch line coupler can comprise four transmission lines that couple mutually.The plurality of transmission line is common formation one open squares, and the length of each the plurality of transmission line can be about 0.25 times of wavelength of a center frequency of operation of main antenna 140.The polarised direction of main antenna 140 can adjust by the feed-in phase difference between first input end mouth 121 and second input port 122 of change microstrip line coupler 120.Detailed adjustment mode by after embodiment in explain.
Crown cap 130 is the tops that are arranged at microstrip line coupler 120, and is to be coupled to ground plane 110.Crown cap 130 can be roughly a square, but is not limited in this.For instance, crown cap 130 also can be roughly a circle, an equilateral triangle, or a regular hexagon.In certain embodiments, antenna system 100 also can comprise multiple short cut holing of main and auxilliary shafts parts (Shorting Vias) 131, and crown cap 130 is to be coupled to ground plane 110 via the plurality of short cut holing of main and auxilliary shafts part 131.For example, the quantity of the plurality of short cut holing of main and auxilliary shafts part 131 can be 4, and the plurality of short cut holing of main and auxilliary shafts part 131 can be coupled to respectively multiple corners of crown cap 130.In more detail, crown cap 130 has one first upright projection on ground plane 110, and microstrip line coupler 120 has one second upright projection on ground plane 110, and wherein this second upright projection is positioned at the inside of this first upright projection completely.Crown cap 130 is for reducing the radiated interference to antenna system 100 from microstrip line coupler 120, and can be used for strengthening the gain of main antenna 140.The detailed operation principles of crown cap 130 by after embodiment in explain.
Main antenna 140 can be that double-fed enters a patch antenna (Patch Antenna) of (Dual-feeding), and can be roughly a rectangle.By adjusting the feed-in phase difference between two load points of main antenna 140, main antenna 140 can operate in different polarised directions.In certain embodiments, antenna system 100 also can comprise the multiple Parasiticas 150 that are adjacent to main antenna 140.For example, the quantity of the plurality of Parasitica 150 can be 4, and each the plurality of Parasitica 150 can be roughly a vertical bar shaped.The plurality of Parasitica 150 separates with main antenna 140, and main antenna 140 roughly by 150 of the plurality of Parasiticas around.In certain embodiments, each self-forming one coupling gap GC1 between each the plurality of Parasitica 150 and main antenna 140, wherein coupling gap GC1 can be less than 1mm.By mutual coupling effect therebetween, the plurality of Parasitica 150 can increase the frequency range of main antenna 140.Must be noted that the element of selecting that the plurality of Parasitica 150 is antenna system 100, in other embodiments also removable it.
Fig. 3 A shows the CURRENT DISTRIBUTION in the time that main antenna 140 is excited (Current Distribution) figure according to the crown cap 130 described in one embodiment of the invention, and wherein arrow represents surface current (Surface Current).In the embodiment of Fig. 3 A, microstrip line coupler 120 is by driven in phase (Driven In Phase), and wherein the feed-in phase difference between the first input end mouth 121 of microstrip line coupler 120 and the second input port 122 is 0 degree.Now, the direction of the surface current on main antenna 140 is roughly parallel to x axle, and the direction of surface current on crown cap 130 is also roughly parallel to x axle.
Fig. 3 B shows according to the crown cap 130 described in another embodiment of the present invention the current distributing figure in the time that main antenna 140 is excited, and wherein arrow represents surface current.In the embodiment of Fig. 3 B, microstrip line coupler 120 is inverted driving (Driven Out of Phase), and wherein the feed-in phase difference between the first input end mouth 121 of microstrip line coupler 120 and the second input port 122 is 180 degree.Now, the direction of the surface current on main antenna 140 is to be roughly parallel to y axle, and the direction of surface current on crown cap 130 is also roughly parallel to y axle.
As shown in Fig. 3 A, 3B, the sense of current of crown cap 130 and main antenna 140 can adjust by this feed-in phase difference between first input end mouth 121 and second input port 122 of change microstrip line coupler 120.Therefore, antenna system 100 of the present invention can produce various polarised directions easily, to receive or to transmit the signal of different polarised directions.It must be appreciated, the present invention is not limited in as described above.In other embodiments, the first input end mouth 121 of microstrip line coupler 120 and the signal phase of the second input port 122 also as follows the mode of list one and table two set (symbol " (X) " represent no signal turnover corresponding ports):
Figure BDA0000440000530000051
Table one: the signal phase of microstrip line coupler 120
Figure BDA0000440000530000052
Table two: the signal phase of microstrip line coupler 120
According to a measurement, in the time that main antenna 140 is excited, crown cap 130 is also excited by mutual coupling effect by microstrip line coupler 120, and the direction of surface current on the polarised direction forming because of the surface induction function of current on crown cap 130 and main antenna 140 is roughly the same.Therefore, crown cap 130 can be considered another auxiliary antenna of antenna system 100.Crown cap 130 can form an aerial array (Antenna Array) jointly with main antenna 140, and the gain of this aerial array approximately can equal the gain summation of crown cap 130 and main antenna 140.According to this measurement, after adding crown cap 130, the entire gain of antenna system 100, overall directive property, and antenna bandwidth all can promote effectively.
In addition, in the time that main antenna 140 is excited, the direction of the surface current on crown cap 130 is roughly contrary with the direction of the surface current on microstrip line coupler 120.It must be appreciated, microstrip line coupler 120 can not produce radiation conventionally in low frequency operation, but can in high-frequency operation, produce radiation.In high frequency band, tend to and radiation generation destruction interference from main antenna 140 from the radiation of microstrip line coupler 120, and then reduce the performance of main antenna 140.Therefore, after adding crown cap 130, the electric current being induced by microstrip line coupler 120 on crown cap 130 is to be in reverse to the electric current of microstrip line coupler 120 own, therefore the reverse current of crown cap 130 can be used for offsetting the unnecessary radiation from microstrip line coupler 120, and then improve the antenna efficiency of main antenna 140.
In preferred embodiment, antenna system 100 of the present invention can operate in a frequency band of about 60GHz.This aerial array jointly forming due to crown cap 130 and main antenna 140 can provide enough frequency ranges, adopt a device for mobile communication of antenna system 100 (for example: a television set directly mass data to be sent to a receiving terminal, or various display unit), and must be through the program of any data compression.Compared with traditional design mode, antenna system 100 of the present invention at least has minification, adjustable polarised direction, promoting transmission rate is provided, and improves the advantage of transfer of data quality.
It should be noted that above-described component size, component parameters, component shape, and frequency range all non-be restrictive condition of the present invention.Antenna Design person can need to adjust these set points according to difference.In addition, antenna system of the present invention is not limited in Figure 1A, 1B, 2A, 2B, the illustrated state of 3A, 3B.The present invention can only comprise any one or more of features of any one or more embodiment of Figure 1A, 1B, 2A, 2B, 3A, 3B.In other words be not, that all illustrated features must be implemented in antenna system of the present invention simultaneously.
Ordinal number in this specification and claim, for example " first ", " second ", " 3rd " etc., do not have the precedence relationship in order each other, and it only distinguishes two different elements with same name for indicating.
Although disclosed the present invention in conjunction with above preferred embodiment; but it is not in order to limit scope of the present invention; anyly be familiar with this operator; without departing from the spirit and scope of the present invention; can do a little change and retouching, therefore protection scope of the present invention should with enclose claim was defined is as the criterion.

Claims (11)

1. an antenna system, comprising:
Ground plane;
Microstrip line coupler, has first input end mouth, the second input port, the first output port, and the second output port;
Crown cap, is arranged at the top of this microstrip line coupler, and is coupled to this ground plane; And
Main antenna, is coupled to this first output port and this second output port of this microstrip line coupler.
2. antenna system as claimed in claim 1, wherein this crown cap is used for reducing the interference from this microstrip line coupler, and for strengthening the gain of this main antenna.
3. antenna system as claimed in claim 1, also comprises:
Multiple short cut holing of main and auxilliary shafts parts, wherein this crown cap is coupled to this ground plane via the plurality of short cut holing of main and auxilliary shafts part.
4. antenna system as claimed in claim 1, wherein this metal is placed on and on this ground plane, has one first upright projection, this microstrip line coupler has one second upright projection on this ground plane, and this second upright projection is positioned at the inside of this first upright projection completely.
5. antenna system as claimed in claim 1, wherein in the time that this main antenna is excited, the direction of the surface current on the direction of the surface current on this crown cap and this main antenna is roughly the same, makes the common aerial array that forms of this crown cap and this main antenna.
6. antenna system as claimed in claim 1, wherein, in the time that this main antenna is excited, the direction of the surface current on this crown cap is roughly contrary with the direction of the surface current on this microstrip line coupler, makes to be cancelled from the radiation of this microstrip line coupler.
7. antenna system as claimed in claim 1, wherein this microstrip line coupler is one 90 degree branch line couplers, it comprises four transmission lines that couple mutually, and the length of each the plurality of transmission line is about 0.25 times of wavelength of a center frequency of operation of this main antenna.
8. antenna system as claimed in claim 1, also comprises:
Multiple Parasiticas, are surrounded on this main antenna, and wherein the plurality of Parasitica separates with this main antenna, and each self-forming one coupling gap between each the plurality of Parasitica and this main antenna.
9. antenna system as claimed in claim 8, wherein the plurality of Parasitica is for increasing the frequency range of this main antenna.
10. antenna system as claimed in claim 1, wherein the polarised direction of this main antenna adjusts by the feed-in phase difference changing between this first input end mouth and this second input port of this microstrip line coupler.
11. antenna systems as claimed in claim 1, wherein this antenna system operates in a frequency band of about 60GHz.
CN201310729083.3A 2012-12-21 2013-12-17 Antenna system Active CN103887595B (en)

Applications Claiming Priority (4)

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US201261745197P 2012-12-21 2012-12-21
US61/745,197 2012-12-21
US14/073,430 US9548526B2 (en) 2012-12-21 2013-11-06 Small-size antenna system with adjustable polarization
US14/073,430 2013-11-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107302133A (en) * 2017-05-19 2017-10-27 成都银丰信禾电子科技有限公司 Ka wave band large-angle scanning circular polarization microstrip antenna arrays
CN111129749A (en) * 2018-10-31 2020-05-08 华为技术有限公司 Dual-polarized antenna, antenna array and communication equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172128A (en) * 1989-11-24 1992-12-15 Thomson-Csf Antenna with circular polarization, notably for antenna array
US20040257292A1 (en) * 2003-06-20 2004-12-23 Wang Electro-Opto Corporation Broadband/multi-band circular array antenna
CN101242027A (en) * 2007-11-12 2008-08-13 杭州电子科技大学 Polarization antenna for directional coupler feedback low profile back cavity round
CN201673999U (en) * 2009-12-25 2010-12-15 泉州佳信天线有限公司 Horizontal polarized wide-frequency omnidirectional antenna

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172128A (en) * 1989-11-24 1992-12-15 Thomson-Csf Antenna with circular polarization, notably for antenna array
US20040257292A1 (en) * 2003-06-20 2004-12-23 Wang Electro-Opto Corporation Broadband/multi-band circular array antenna
CN101242027A (en) * 2007-11-12 2008-08-13 杭州电子科技大学 Polarization antenna for directional coupler feedback low profile back cavity round
CN201673999U (en) * 2009-12-25 2010-12-15 泉州佳信天线有限公司 Horizontal polarized wide-frequency omnidirectional antenna

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107302133A (en) * 2017-05-19 2017-10-27 成都银丰信禾电子科技有限公司 Ka wave band large-angle scanning circular polarization microstrip antenna arrays
CN111129749A (en) * 2018-10-31 2020-05-08 华为技术有限公司 Dual-polarized antenna, antenna array and communication equipment
US11831084B2 (en) 2018-10-31 2023-11-28 Huawei Technologies Co., Ltd. Dual-polarized antenna, antenna array, and communications device

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